Utility for copying ID3v2 tags to ID3v1?

I'm looking for a utility which will copy existing ID3v2 tags to ID3v1 counterparts alongside the original metadata in MP3 files. I have some legacy hardware that I'm not giving up any time soon and it is incompatible with ID3v2, so I need both kinds of tags present in my files to keep everyone happy. I've been using EasyTAG which can create both tags in its files, but I'm looking for a way to run files through a script to automate the process. I've been using Python's Mutagen library, but it only supports ID3v2.